Stage 3 - Gas Supply Connection - Neptronic SKG3 Series Installation Instructions Manual

CAUTION : Gas piping installation MUST comply with all local codes and regulations, and
!
current ANSI Z223.1, ''National Fuel Gas Code'' or CAN/CSA-B149.
Gas pressure to the Humidifier MUST never exceed 26'' w.c. (6kPa).
A manual shut off valve (not supplied) MUST be installed on the Gas supply line to the
Humidifier. Ensure adequate size for the Gas supply line (see below table).
A ⅛'' NPT plugged taping for test pressure gauge connection should be installed
immediately upstream of the Gas supply line.
Pipes should be inspected for dirt and chips after threading and reaming the end of pipes.
Gas piping installation should be supported so that no strains are imposed on the
Humidifier or controls.
Two wrenches should be used when connecting piping to Humidifier.
Drip pocket should be provided at any low spot in the Gas line.
Minimum Gas pipe gradient should be ¼'' (1.5mm) in 40'' (1m) horizontal run.
Air purge should be done by disconnecting piping at Gas valve.
Air purge MUST NOT be done at Heat exchanger of the Humidifier.
After installation, field piping and Humidifier gas train should be checked for leak.
Do not use soap solution or open flame on humidifier gas train. Gas Leak Detector should
be used.
All leaks MUST be sealed prior to commissioning the Humidifier.
Gas pipe
diameter
Please refer to local codes and regulations regarding type, volume of gas handled, for
pressure drop allowed in the gas line and to determine gas pipe diameter.
When multiple SKG3 Humidifier modules are installed, total capacity, gas flow and length
of main should be taken into account.
SKG3
Pressure testing of the gas supply piping should be performed by the gas
Gas leak test
installer in accordance with local codes and regulations.
Test pressure should be relieved from the gas piping system prior to opening the
manual shut off valve of the Humidifier.
For any test pressure over 50psig (350kPa) Humidifier MUST be disconnected
(at Gas shut off valve).
Gas supply pressure at the inlet pressure tap, when all burners running, should
be:


Stage 3 – Gas Supply Connection
Model
SKG3-
110, 155, 180, 210,
265, 310, 350, 405
SKG3-
505, 560, 610,
710, 765, 810
Optional 1/8'' NPT
Plugged taping for
test pressure gauge
Gas supply connection -
7'' w.c. (1.75kPa) for Natural Gas.
14'' w.c. (3.5 kPa) for Propane and Butane.
20
SKG3 Steam Humidifier
Gas
Connection size
1'' NPT
Female
1-1/2'' NPT
Female
¼ turn gas
valve
Drip pocket
Fig. 30